Home / 5,129.12-7,077.98-2,891.43

Finding the Fourth Proportional to 5,129.12, 7,077.98 and 2,891.43

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Solution

The fourth proportional to 5,129.12, 7,077.98 and 2,891.43 is: 3,990.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.12 : 7,077.98 = 2,891.43 : x
  2. Step 2: Convert to fraction form
    5,129.12/7,077.98 = 2,891.43/x
  3. Step 3: Cross multiply
    5,129.12x = 7,077.98 × 2,891.43
  4. Step 4: Simplify right side
    5,129.12x = 20,465,469.25
  5. Step 5: Solve for x
    x = 20,465,469.25/5,129.12
  6. Step 6: Final answer
    x = 3,990.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.